榆树耐旱,耐瘠薄,适应性强,是西北地区植树造林的主栽树种之一。合理修剪是培养干形,提高木材利用率的有效措施。春、秋、冬均可修枝。修枝方法,有以下几种: 1.定植期的定头修剪。一般情况可直接用主梢做领头枝,如果领头枝损伤,可用下部竟争枝代替。对少数主梢不明显的双杈和多杈枝,可选其中 Elm drought tolerance, infertility, adaptability, is one of the main tree species planted in Northwest China. Reasonable pruning is to cultivate dry, improve the utilization of wood is an effective measure. Spring, autumn and winter can be pruned. Pruning methods, there are the following: 1. Colonization of the head pruning. In general, the main branch can be used directly to lead the main branch, if the lead branch injury, can be replaced by the bottom branch competition. Not obvious on a few main twins and more branches, optional one